Backplane for eye-mounted display

• US 10,580,349 B2
• Filed: 02/09/2018
• Issued: 03/03/2020
• Est. Priority Date: 02/09/2018
• Status: Active Grant

• Current Assignee: Tectus Corporation
• Original Assignee: Tectus Corporation
• Inventors: Martin, Paul Scott, Winoto, Renaldi, Opris, Ion, Manolescu, Mihai-Costin
• Primary Examiner(s): Rayan, Mihir K
• Application Number:
  US15/892,891
• Publication Number:
  US 20190251893A1
• Time in Patent Office: 753 Days
• CPC Class Codes: G02B 17/0808 on-axis systems with at least one of the mirrors having a central aperture
• CPC Class Codes: G02B 27/0018 with means for preventing ghost images anti-reflection coatings G02B1/11
• CPC Class Codes: G02B 27/0093 with means for monitoring data relating to the user, e.g. head-tracking, eye-tracking
• CPC Class Codes: G02B 27/0172 characterised by optical features
• CPC Class Codes: G02C 11/10 Electronic devices other than hearing aids
• CPC Class Codes: G02C 7/04 Contact lenses for the eyes disinfection or sterilisation of contact lenses A61L12/00
• CPC Class Codes: G09G 2300/0452 Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components
• CPC Class Codes: G09G 2320/0626 for control of overall brightness
• CPC Class Codes: G09G 2320/0673 for control of gamma adjustment, e.g. selecting another gamma curve
• CPC Class Codes: G09G 2340/16 Determination of a pixel data signal depending on the signal applied in the previous frame
• CPC Class Codes: G09G 3/003 to produce spatial visual effects
• CPC Class Codes: G09G 3/2081 with combination of amplitude modulation and time modulation space and time error diffusion G09G3/2066
• CPC Class Codes: G09G 3/32 semiconductive, e.g. using light-emitting diodes [LED]

Abstract

An eye-mounted display includes a femtoprojector, which includes a backplane and a frontplane. The backplane receives data (e.g., data packets) that specify the image to be projected by the eye-mounted display. It converts this data to drive signals (e.g., current) to drive the frontplane. The frontplane contains an array of light emitters (e.g., LEDs) that produce light according to the drive signals, thus generating the desired image. In one approach, the image is deconstructed and transmitted to the backplane as needed as microframes which are displayed asynchronously and only for regions where the image has changed, rather than continuously scanning full picture frames at the full frame rate. In another aspect, the femtoprojector has variable pitch between adjacent light emitters.

Claims

1. A backplane that fits in an eye-mounted display, the backplane receiving data packets that specify images to be projected by a frontplane containing an array of light emitters that also fits in the eye-mounted display, the backplane converting the data packets to drive signals that drive corresponding subsets of the light emitters in the frontplane, where:

the data packets specify subframes to be projected by the corresponding subsets of light emitters using a protocol that does not require receiving full frames for the entire array of light emitters; and

the drive signals cause the corresponding subsets of light emitters to produce light.

2. The backplane of claim 1 where the drive signals cause the corresponding subsets of light emitters to produce light when the drive signals are applied but without persistent light production after the drive signals cease to be applied.

3. The backplane of claim 1 where the subframe comprises an N×

2 array of pixels, and N is an even integer greater than 3.

4. The backplane of claim 1 where the data packet specifies a location of the subframe within the array of light emitters.

5. The backplane of claim 1 where the data packet specifies whether the drive signals turn off at an end of the subframe or stay on at the end of the subframe.

6. The backplane of claim 1 further comprising:

a memory that stores pixel values of a previous subframe, where the data packet specifies whether to repeat the previous subframe.

7. The backplane of claim 1 where the data packet specifies the pixel values in the subframe using a combination of pulse width modulation and pulse amplitude modulation.

8. The backplane of claim 7 where, in accordance with the protocol, the pulse width modulation can be based on different gamma values, and the data packet specifies which gamma value is used.

9. The backplane of claim 7 where, in accordance with the protocol, the pulse width modulation can be based on different numbers of bits, and the data packet specifies the number of bits used.

10. The backplane of claim 7 where, in accordance with the protocol, the pulse amplitude modulation can be based on different numbers of bits, and the data packet specifies the number of bits used.

11. The backplane of claim 7 where the subframe comprises a plurality of pixels and the data packet specifies the pixels in the subframe using a combination of one or more group values that apply to more than one pixel in the subframe and pixel-specific values that apply to individual pixels in the subframe, where the one or more group values are based on pulse amplitude modulation and the pixel-specific values are based on pulse width modulation.

12. The backplane of claim 1 where the subframe comprises a plurality of pixels and the data packet specifies the pixels in the subframe using a combination of a global value that applies to all pixels in the subframe, local values that apply to groups of pixels in the subframe, and pixel-specific values that apply to individual pixels in the subframe.

13. The backplane of claim 12 where all the pixels within a group are a same color.

14. The backplane of claim 1 where the backplane detects when no data packets are received and powers down the frontplane based on detection of no data packets received.

15. The backplane of claim 1 where the backplane comprises a plurality of analog drivers that are coupled to drive the light emitters.

16. The backplane of claim 1 where the backplane consumes not more than 100 microwatts of power.

17. The backplane of claim 1 where the backplane is not larger than four mm².

18. The backplane of claim 1 where the smallest pitch between adjacent light emitters is less than 3 microns.

21. The backplane of claim 1 where sequential subframes received at the backplane are not required by the protocol to update the light emitters according to a predefined spatial order.

22. The backplane of claim 1 where the protocol does not require the entire array of light emitters to be refreshed at a constant rate.

19. An eye-mounted display comprising:

a contact lens; and

a backplane and a frontplane that fit in the eye-mounted display, the frontplane containing an array of light emitters, the backplane receiving data packets that specify images to be projected by the frontplane, the backplane converting the data packets to drive signals that drive corresponding subsets of the light emitters in the frontplane, where;

the data packets specify the images using a protocol that does not require receiving full frames for the entire array of light emitters;

the data packets specify subframes to be projected by the corresponding subsets of light emitters; and

the drive signals cause the corresponding subsets of light emitters to produce light.

20. A method for communicating images to be displayed by an eye-mounted display, the eye-mounted display comprising a backplane and a frontplane containing an array of light emitters, the method comprising:

deconstructing the images into subframes to be projected by corresponding subsets of light emitters; and

transmitting to the backplane data packets that specify the subframes, the transmission using a protocol that does not require receiving full frames for the entire array of light emitters, where the backplane converts the data packets to drive signals that cause the corresponding subsets of light emitters to produce light.